You guys are that are saying the plane will take off due to wind from the belt are basically saying that with a big enough jet engine a Plane could do a Burn out.

LOL.

 

I just Sent the Qustion To NASA... we'll see if they get back to me

Justin

 

They will, but it will take 12 years and billions of dollars of research.

 

AS long as i get an awnser

 

Anybody post it over on the Ford truck boards? Maybe get their minds off the junk engine they have in their trucks.

 

HA!!! I find it funny that even the "smart" folks can't agree on whether the plane will fly or not!!

http://forum.physorg.com/index.php?showtopic=2417&st=0

If THEY can't figure it out, y'all never stood a chance.

Fortunately, I am a genius.

 

LOL what a bunch of idiots. how that one is worded the plane could take off. becuse it is matching the speed of the plane and not the wheels.
on that one the plane is going forward at 10 mph the belt is going backwards at 10 mph and the wheels are going forward at 20 mph.....

 

My second post......Guys, the treadmill has to effect on the movement of the plane, IT can NOT stop the plane from moving, so the plane does move. And will take off. The ideas of the treadmill creating wind/lift is not correct. The treadmill can not keep the plane from moving forward no matter how fast it spins the planes wheels. The speed of the plane forward = 200, the speed of the treadmill = 200..........the planes speed is still 200......the wheels go 400. The original question states the treadmill matched the speed of the plane. The speed of the plane and the speed of the wheels are two entirely different things. Plane goes 10 mph treadmill goes 10 mph, the answer is NOT that the plane is not moving, the answer is that the wheels are going 20 mph.

So how do you measure thrust HP on a drum dyno?

 

Yes, the plane will fly. The engines are working against the atmosphere with the restraining force of aerodynamics and the inertia (mass) of the plane hindering acceleration. This isn't any different from the normal operation of the airplane on takeoff. All the wheels do is hold the plane off the ground - counteract gravity. Wheel speed (so long as the brakes aren't applied and bearing drag is small) is irrelevant.

Think of it this way: If the bearings are frictionless, how much force can the conveyor belt apply to the plane in a fore/aft direction, the direction that would restrain it from accelerating? Vector algebra.

Rusty

 

on that one... on ours that wont work becuase the belt is matching the speed of the wheels wich is impossoble to do while moving forward...

 

they locked the thread on the Diesel place within 4 posts... LOL.. and about 5 mins.

 

Have I ever told you guys, I have a fear of flying.................and this isn't helping

 

Dont worry the planes not going to fly

 

No, it cannot. There must be relative motion between the wing (source of lift), and the air across it.

When the throttles are advanced, the thrust of the engines pushes against the air. Normally, this would be converted to forward motion as the plane rolls forward on its wheels.

But on the conveyor, the plane cannot convert its thrust to fwd motion because of the counterbalancing effect of the conveyor belt motion. Thus, not relative motion between wing and atmosphere, and therefore no lift.

No if the conveyor was free-wheeling, the pilot could get the plane to takeoff by applying the brakes. This would eliminate the motion of the wheels, and therefore the countermotion of the belt. If the belt freewheeled, then the thrust of the plane could would cause it to "ride the belt" until it hit rotational velocity.

jh

 

Justin,

Mechanics 101 - Statics and Dynamics - vectors. If the bearings are frictionless and the wheels aren't braked, how much fore/aft force can the wheels impart to the plane to counteract the thrust of the engines?

Conveyor (groundspeed) and wheel rotational speed and direction are meaningless - airspeed alone will determine whether or not the plane takes off, and the conveyor can't affect acceleration and resultant airspeed since the bearings are frictionless and can't restrain the plane - only the plane's mass and drag are working against engine thrust.

Rusty